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WLAN Fundamentals (WBT)

WLAN Fundamentals (WBT) 
WLAN Fundamentals (WBT)
Have you ever wondered how wireless networks work? How a radio signal can be used to carry high-bandwidth data? How it can be possible to secure traffic broadcast over a wireless connection? This course explains these concepts in detail, starting with the bodies responsible for setting the underlying standards, and how 802.11 Wireless Local Area Networks (WLANs) operate. We discuss the Physical (PHY) and Media Access Control (MAC) specifications for 802.11 WLANs, how an RF signal propagates in air in the presence of obstacles, and how to secure the vulnerable wireless signal. This two hour course is appropriate for anyone new to wireless networking and looking to learn the basics, as well as anyone wanting to brush up on a particular topic. This course consists of detailed descriptions of WLAN functionality and behavior.

This course covers the following topics:

Standards and standards bodies

  • Standards and standards bodies
  • The 7-layer OSI Model
  • WLAN standards
  • The IEEE 802 LMSC
  • Who or what is the WFA?
  • Other relevant standards
  • RFC4118 WLAN architectures
  • Why WLAN switching?

The 802.11 Physical Layer (PHY)

  • The RF spectrum
  • Spread spectrum techniques
  • Frequency Hopping Spread Spectrum (FHSS)
  • Direct Sequence Spread Spectrum (DSSS)
  • Orthogonal Frequency Division Multiplexing (OFDM)
  • Multi-Input Multi-Output (MIMO)
  • 802.11n
  • The impact of .11n for switched wireless LANs

The 802.11 Media Access Control sub-layer (MAC)

  • Framing
  • Frame timing
  • Quality of service
  • Client association process
  • Media access
  • The hidden node problem
  • CSMA/CA in operation
  • Reliable delivery
  • 802.11n frame aggregation
  • Other 802.11n MAC enhancements
  • Automatic Power Save Delivery (APSD)
  • IEEE 802.11 WLAN summary

RF coverage issues

  • Antennas
  • dB math and EIRP
  • Receiver sensitivity
  • Free space WLAN coverage
  • RF obstacles
  • Multipath
  • 802.11n coverage
  • Approaches to coverage planning
  • Coverage or capacity?

Wireless LAN security

  • What is the threat?
  • The nature of the problem
  • WLAN authentication
  • WLAN encryption
  • Message integrity
  • Ensuring availability
  • Backdoor prevention
  • Enterprise recommendations
  • Miscellaneous issues